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To set the controller's address
The RTU Open's two rotary switches determine the RTU Open's MAC address when it is placed on an MS/TP
network. The rotary switches define the MAC address portion of the RTU Open's BACnet device instance number,
which is composed of the MS/TP network number and the MAC address. They also set the slave address on a
Modbus or N2 network when less than 100. See the RTU Open Integration Guide for additional information on
integration.
1
Turn off the RTU Open's power. The controller reads the address each time you apply power to it.
2
Using the rotary switches, set the MSB (SW1) (10's) switch to the tens digit of the address, and set the LSB
(SW2) (1's) switch to the ones digit.
EXAMPLE To set the RTU Open's address to 01, point the arrow on the MSB (SW1) switch to 0 and the arrow
on the LSB (SW2) switch to 1.
SW2
MSB
SW1
0
10's
3
Turn on the RTU Open's power.
CAUTION The factory default setting is 00 and must be changed to successfully install your RTU Open. The
MAC address of the controller must be unique on its network.
To set the controller's communications protocol and baud rate
RTU Open's SW3 DIP switches are used to set the controller's protocol and baud rate. The protocol and speed
selection is determined by the network on which the controller will be installed. For Carrier BACnet
implementations, select MS/TP @ 76.8 k as follows:
1
Power down the RTU Open. The controller reads the protocol and baud rate each time you apply power to it.
2
Set SW3 DIP switches 1, 2, and 4 to On to configure the controller for BACnet MS/TP and 76.8 k baud.
3
Power up the RTU Open.
NOTE Other protocols and baud rates are available. See the RTU Open Integration Guide for additional
instructions.
RTU Open v3
Installation and Start-up Guide
LSB
0
1's
11
Installing the RTU Open
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